Wolfgang Amadeus Mozart's Piano Sonata No. 17 in B-flat major, K. 570 (February 1789) is a sonata in three movements:
A typical performance takes about 18 minutes.
There is an accompanying violin part of doubtful origin in many 1800 editions; the piano part is exactly the same as for piano solo. Neue Mozart Ausgabe (NMA) hold it as an addition by either André or another. Description at Mozarteum.